Elihu thomson



(No Model.)

B. THOMSON. ARMATURE FOR DYNAMO ELECTRIC MACHINES. No. 356,902. Patented Feb. 1, 1887.

i 3y iflkworweyl PEfERS 0a., vHoro-wmm wnsumorcn n c UNITED STATES PATENT OEEIc ELIHU THOMSON, OF NElV BRITAIN," CONNECTICUT, ASSIGNOR TO THE THOMSON-HOUSTON ELEGTRIC'COMPANY, OF BOSTON, MASS.

ARMA TURE FOR DYNAMO-ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No.356,902, dated February 1, 1887.

Application filed May 25, 1883.

To all whom it may concern.-

State of Connecticut, have invented certain new and useful Improvements in Armaturcs for Dynamo-Electric Machines, of which the following is a specification.

My invention relates to the armature cores or carriers upon which the coils or bobbins for the armatures of a dynamo-electric machine are wound, and more especially to'a car- .rier formed of metallic tape or ribbon made of fine iron or homogeneous soft steel and wound on edge on suitable supports.

My invention consists of a cylindrical or annular core or carrier for the armature-coils of a dynamoelectric machine composed oi one or more helices of iron of any convenient cross section, but preferably made of thin sheet-iron plates or ribbons set on edge and wound or otherwise formed into a helix concentric with the armatureshaft in any desired manner. i I

My invention also consists in certain details .in the form of a ribbon or plate on an armature of this description, the object of which is to avoid the-diiiiculty in winding or bending theplate or ribbon to the circumferenccof the armature, owiugmo the difference in circumferential length of the inner and outer edges when so wound. This difficulty is obviated by my'iuventicn, which consists in giving to either or both edges of the tape or ribbon, a sinuous, undulating, or other irregular form in the plane of its width, so as to compensate for the difference in the circumferential lengths of the curves which they follow. This may be accomplished by bending the inner edge to one side and the other of the general circumferential line which it follows, such bending being done in the act of winding or placing the tape or ribbon on its supports, so that when in place the inner portion of thetape will have a sinuous or undulating form; or, if desired, an irregular or wavy shape may be given to both edges of the ribbon before winding, so that the outersinuosities will straighten when the tape is wound, the inner remaining, so as to produce the required com- Serial No. 96,091. (No model.)

pensation; or the edge, one or both, of the tape may be indented at intervals in a direction transverse to its plane,or formed in other ways, as will be hereinafter described. The tape used is by preference coated with a flexible insulator before use, or may be scaled, blued, enameled, or otherwise treated, so as to form an insulating" film upon it, or the various turns may be separated by interposed insulationl Some of the various methods of carrying out my invention are herein described specifically and shown, but the general method admits of many modifications, and consists, broadly, in making the inner and outer edges of the tape as wound dissimilar in course, so as to compensate for the difference in length of the circumferential spaces covered by them. In the accompanying drawings, Figure 1 illustrates a tape as applied on edge to a circular form over which it is to he wound. Fi

2 shows one turn of the tape in the form which I give it to enable it to encompass the circular form or carrier. Fig. 3 is a cross-section of a portion of a spirallywound tape wound edgewise, and shows several of the spiral convolutions. Fig. i is a perspective view of an annular band made according to my invention and designed for use as an armature-core. Fig. 5 is a perspective view of a portion of the spiral tape-windings when applied to a support and designed for use as a cylindrical armature-carrier. Fig. (iillustrates the method of winding thetape or ribbon upon bars pro vided for it. Figs. 7, 8, and Qillnstrate other forms that may be given to the tape for carrying out my invention. Figs. 10 and 11 are diiferent views of the form shown in Fig.9 and will be described in detail farther on.

In Fi 1, A is a supposed circular form upon which a ribbon, it, is to be wound. Ordinarily this is difficult, but may he accomplished by stretching the outer edge, S, and correspoiniingl y compressing the inner edge, T. According to one method of carrying out my invention I give the inner edge or portion a wavy or criinpcd outline, while the outer edge or portion, S, is plain or uniform, whereby the winding may be easily and readily effected and a care be built up either of separate rings formed of one or more convolutions of tape and piled upon one another or placed side by side upon the same axis, or of a continuously and spirally wound tape. One of these rings formed by a single convolution is shown in Fig. 2 in side view, in which the sinuositics or irregularities of the inner portion of the tape are indicated at T T T.

Fig. 3 shows in section aportion of a core madeof a tape or ribbon ofsutlicieut length to be wound spirally, while Fig. 4 shows the same in perspective.

The inner portion of the tape is crimped, corrugated, or sinuous, as before. The sinuosities may match one another in the contiguous turns, or not, as desired.

In Fig. 5 X indicates an armature-shaft carrying heads, flanges, or frames H II, connected by bars 13 B, of any desired number suiiicient to give a general cylindrical form to the completed structure. Eight such bars are here shown. Upon these bars is wound the ribbon It. set edgewise upon the frame, and covering the bars so as to produce a cylindrical armature-core, upon which wire may be wound longitudinally in the ordinary way. In this case the bars B B, which may be re placed by any ribbed support, afford a help in giving a wavy outline to the ribbon or tape as 'it is wound, as indicated in Fig. 6, where the inner edge is alternately deflected to one side or the other as it passes successive bars 13.

Fig. 7 shows a crimped ribbon. the waves or corrugations in which are produced in any suitable manner and are equal at the two edges. Vhen wound on a curved frame, the inner edge only retains its full waviness, while the other is drawn more or less straight during the winding. This is the simplest form of my invention, and requires the least attention in winding the tape.

In Fig. 8 the outer edge or portion of the ribbon or tape is indented, bent, or crimped at intervals, which may be done by pressure between suitable rolls or surfaces, so as to spread or lengthen the outer edge and at the same time weaken its resistance to stretching, thus permitting it to be wound on a curved form. The same result may be accomplished by indenting or crimping the inner portion, as indicated in Fig. 9, thus weakening the inner edge, so as to permit a ready coiuprcs sion thereof for the same purpose.

Fig. 10 is a section of Fig. 9, and shows more clearly the crimp or dent formed at the inner edge of the tape.

Fig. 11 is a back view of Fig. 9, showing that the indentations may have their corresponding projections, which will form during the making of the notches or indentations or during winding, according to well-known mechanical principles.

It will be seen that my invention is applicabloto forming cores having all hiiulsofoutlines, consisting wholly of curves or combinations of curved and straight lines. Annular, cylindric, spherical, ellipsoidal, or other forms may be originated by winding the ribbon upon a form or frame-work ofthc pattern desired.

What I claim as my lllVQlltlOjl is 1. An armature core or body consisting of thin or flexible iron ribbon or tape set edgewise to the axis of the armature, and formed, as described, at one or both edges so as to compensate for the difference in the length of its inner and out-er circumference.

2. An armature made .up with fiat wire or tape set on edge and curved to the outline of the armature, said tape having a sinuous or indented surface upon its inner portion, as and for the purpose described.

3. An armature-core made up of tape or ribbon set edgewise and criniped, curved, or corrugated at its in nor portion, so as to lessen the circumferential space covered thereby.

A. In an armature, the combination, with a frame having longitudinal bars or ribs, oi flat ribbon or tape wound edgcwise thereupon, as and for the purpose described.

5. In an armature, the combination, with the longitudinal supporting-ribs, of the rib bon or tape wound edgewise upon the same and given a crimpcd or wavy 'l'orm byimpingement upon the ribs.

6. Au annular or cylindrical armature core or carrier formed of a helix of thin iron plate or ribbon set on edge concentric with the armature-shaft and having its successive turns insulated from one another.

7. A hollow cylindrical armature-core composed of iron spirals or helices concentric with and suitably supported upon an arma tare-shaft, and having their convolutious re spectively insulated from each other, so as to prevent the circulation of induced currents in the core when said core is provided with induction-coils and rotated in a magnetic field.

S. In a dynamo-electric machine, a hollow cylindrical armature, the core of which is composed of one or more helices adapted to receive armaturecoils traversing said helices parallel with the shaft, and means for supporting the said cylinder and induction-coils upon the shaft.

Signed at Boston, in the county of Suli'olk and State of lllassachusetts, this 23d day of Hay, A. D. 1883.

ELIIIU 'lI i OMSOJ.

Witnesses:

HARRY B. Iloonns, 15.. C. Wnrrsnv. 

